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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Trisetum viride

HABIT Perennial; caespitose. Rootstock evident. Culms 80–150 cm long; 1–2 mm diam. Lateral branches lacking. Leaf-sheaths pilose. Ligule an eciliate membrane; 2–4 mm long; truncate. Leaf-blades 20 cm long; 5–9 mm wide. Leaf-blade surface glabrous, or pilose; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or elliptic; dense; equilateral, or nodding; 20–30 cm long. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels flexuous; 4–5 mm long.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.7 mm long; pilose; with 1.5–2 mm long hairs. Floret callus pubescent.

GLUMES Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma; shiny; gaping. Lower glume elliptic; 5–5.5 mm long; 0.9 length of upper glume; membranous; much thinner above; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume elliptic; 5.5–6 mm long; 1.2 length of adjacent fertile lemma; membranous; much thinner above; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4.5–5 mm long; membranous; much thinner above; keeled; 5 -veined. Lemma surface asperulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; geniculate; 7–9 mm long overall; with twisted column. Palea gaping; 4–4.5 mm long; hyaline. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 1.7–3 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Endosperm liquid.

DISTRIBUTION North America: Mexico. South America: Mesoamericana.

NOTES Aveneae. Fl Nov Gal 1994.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.